It's a collection of math (often number theory) problems that programming can be used to solve. The first 50 are mostly reasonable, and many of them are trivial. Many of them build on previous, so you should start with the lower numbers.

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I think part of the idea too was that people would ask a question that was from PE, but not say it, and then people would accidentally produce spoilers. When this is here explicitly it's just a magnet for that kinda stuff.

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Please do not PM members regarding questions which are meant to be discussed publicly. The point of the forum is so that others can benefit from it. We don't want to help you over PMs or emails.